4.5.1.3 Gravity

Question 1

Weight:

Answer 1

the force that gravity exerts on an object

Question 2

How are the weight and mass of an object related?

Answer 2

they are directly proportional

-weight∝mass

Question 3

W (weight/N)=

Answer 3

= mg (mass/kg x gravitational field strength/N/Kg)

Question 4

What does the weight of an object depend on?

Answer 4

the gravitational field strength

Question 5

Mass:

Answer 5

• the amount of matter an object has in it
• measured in kg with a mass balance

Question 6

What might the weight of an object be considered to act as?

Answer 6

a single point referred to the objects ‘centre of mass’

Question 7

What is weight measured using?

Answer 7

a calibrated spring balance (newtonmeter)

Question 8

What is the force of gravity around the Earth due to?

Answer 8

gravitational field strength

9.8/10

Question 9

What does the strength of the gravitational field strength depend on?

Answer 9

• it’s stronger the closer you are to the mass causing the field
• it’s stronger for larger masses

Question 10

Gravity:

Answer 10

A force of attraction between all objects.

Question 11

What two important effects does gravity have?

Answer 11

• on the surface of a planet, it makes all things fall towards the ground
• it gives everything a weight

Question 12

Gravitational field strength:

Answer 12

A measure of the force of gravity in a particular location.

Question 13

What is the force of gravity close to the Earth due to?

Answer 13

The force of gravity close to the Earth due to the gravitational field around the Earth

Question 14

What are the units of weight?

Answer 14

Newtons (N)

Question 15

Is mass a force?

Answer 15

No

Question 16

What are the units for mass?

Answer 16

It’s measured in kilograms

Question 17

What do you use to measure mass?

Answer 17

you measure mass with a mass balance

Question 18

What sort of quantity is mass and why?

Answer 18

It is scalar quantity because it has no direction